Hello I am rendering exterior scene, and found these splothes on houses. I am using standard vray physical camera with standard parameters. I tried increasing samples in GI irradiance map and light catch, didn't work. I don't know what to do... I included render pictures and my used settings in attachment.
Extra notes:
Lighting system -
Vray sun,
Vray sky,
2 domes: 1 reflections, another diff.